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Investments Distribution by External Credit Rating for Fixed Maturity Securities (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Debt Securities, Available-for-sale    
Fixed Maturity Securities $ 43,011.7 $ 45,457.8
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 3,492.9  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax $ 756.4  
Fixed maturity securities in unrealized loss position percent of total 100.00%  
External Credit Rating, Investment Grade    
Debt Securities, Available-for-sale    
Fixed Maturity Securities $ 39,973.1  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 3,464.2  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax $ 529.5  
Fixed maturity securities in unrealized loss position percent of total 70.00%  
External Credit Rating, Below-Investment-Grade    
Debt Securities, Available-for-sale    
Fixed Maturity Securities $ 3,038.6  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 28.7  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax $ 226.9  
Fixed maturity securities in unrealized loss position percent of total 30.00%